CSC509 Lecture 10

Transcript

1. Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.info o ffi ce: 14 -227

   CSC 508/9 Software Engineering (Design & Deployment) Lecture 10. Publisher-Subscriber

2. Previously MQTT

3. Message Queuing 3

4. Eclipse Paho for Java Wh a t is Eclipse P

   a ho? • A set of MQTT client libr a ries developed by the Eclipse Found a tion. • It supports multiple l a ngu a ges, such a s J a v a , Python, J a v a Script, etc. J a v a Dependency (M a ven) <dependency> <groupId>org.eclipse.paho</groupId> <artifactId>org.eclipse.paho.client.mqttv3</artifactId> <version>1.2.5</version> </dependency> 4

5. https://github.com/CSC3100/MQTT

6. Quality-of-service options • 0 – "at most once": A.K.A. "fire-and-forget."

   This option is suitable when message loss is acceptable, as it doesn't require acknowledgment or persistence. • 1 – "at least once": This option should be chosen when message loss is unacceptable, and your subscribers can handle duplicate messages. • 2 – "Exactly once": This option is ideal when message loss is unacceptable, and your subscribers cannot handle duplicate messages. 6

7. https://github.com/CSC3100/MQTT

8. Pong 8 https://github.com/CSC3100/Pong-Game

9. Assignment 03 Brokerverse

10. MultiPlayer Game 10

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18. Questions 18

19. CSC 509 Software Engineering Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2025

    Copyright. These slides can only be used as study material for the class CSC509 at Cal Poly. They cannot be distributed or used for another purpose.